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Telephoto focal length
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Focus motor
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Pentax K Lenses made by Tamron that have a generic focus motor and have a 300mm or longer focal length

#1

Tamron 70-300mm f/4-5.6 Di LD Macro Pentax K

Tamron 70-300mm f/4-5.6 Di LD Macro Pentax K

"This lens gives you a functional telephoto lens for the price. Operation is smooth and the image quality is good." bhphotovideo.com

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Max focal length 300 mm
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Min focal length 70 mm
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Focus motor Generic motor
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Length 117 mm
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Zoom range 4.3x
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Diameter 76 mm
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Aperture f/4
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Weight 435 g
#2

Tamron 28-300mm f/3.5-6.3 XR Di Pentax K

Tamron 28-300mm f/3.5-6.3 XR Di Pentax K

"We like the 300 mm zoom for bird photos. The auto focus is nice for first time users and occasional users." bhphotovideo.com

 
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Great zoom range
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10.7x
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Max focal length 300 mm
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Min focal length 28 mm
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Focus motor Generic motor
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Length 84 mm
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Zoom range 10.7x
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Diameter 74 mm
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Aperture f/3.5
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Weight 420 g